Writing BMP files (Platform Independent)

Question

I have a structure such as

   typedef struct  FT_Bitmap_
  {
    int             rows;
    int             width;
    int             pitch;
    unsigned char*  buffer;
    short           num_grays;
    char            pixel_mode;
    char            palette_mode;
    void*           palette;

  } FT_Bitmap;

defining my bitmap data

I want to create a valid bmp file from this structure. How can I do that?

Answer 1

Take a look at:

http://en.wikipedia.org/wiki/BMP_file_format

Write out the header, the palette and the data.

Just take care when you write the bitmap data. It's "upside-down" - the first pixel in data is the left-bottom corner pixel.